eth_estimateGas - Tron

Example code for the eth_estimateGas JSON_RPC method. Complete guide on how to use eth_estimateGas JSON_RPC method in GetBlock Web3 documentation.

This method returns an estimate of the Energy required to execute a transaction, expressed in the Ethereum-compatible gas field. On TRON, this maps to Energy rather than gas.

Parameters

Parameter	Type	Required	Description
transaction	object	Yes	Transaction call object

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/jsonrpc' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{"from": "0x41f0cc5a2a84cd0f68ed1667070934542d673acbd8", "to": "0x41a614f803b6fd780986a42c78ec9c7f77e6ded13c", "data": "0xa9059cbb..."}],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/jsonrpc', {
    jsonrpc: '2.0',
    method: 'eth_estimateGas',
    params: [{"from": "0x41f0cc5a2a84cd0f68ed1667070934542d673acbd8", "to": "0x41a614f803b6fd780986a42c78ec9c7f77e6ded13c", "data": "0xa9059cbb..."}],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/jsonrpc',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_estimateGas',
        'params': [{"from": "0x41f0cc5a2a84cd0f68ed1667070934542d673acbd8", "to": "0x41a614f803b6fd780986a42c78ec9c7f77e6ded13c", "data": "0xa9059cbb..."}],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/jsonrpc")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_estimateGas",
            "params": [{"from": "0x41f0cc5a2a84cd0f68ed1667070934542d673acbd8", "to": "0x41a614f803b6fd780986a42c78ec9c7f77e6ded13c", "data": "0xa9059cbb..."}],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0xfb1d"
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	string	Hex-encoded estimated Energy, expressed as gas

Use Cases

• Fee Preview: Estimate the Energy cost of a call

• Fee Limits: Derive a fee limit from the estimate

• Revert Detection: Detect a call that would fail before sending

• Compatibility: Provide gas estimates to Ethereum-style tools

Error Handling

Error Code	Message	Description
-32602	Invalid params	Invalid transaction object or block parameter
-32000	Execution error	The call could not be executed against the current state
-32603	Internal error	The node failed to process the request